Design of Short, High-Rate DVB-S2-Like Semi-Regular LDPC Codes

摘要

This work focuses on high-rate (R>4/5) moderate-length (1000≤n<5000) low-density parity-check codes. High-rate codes allow to maintain good quality of the preliminary decisionsthat are used in carrier recovery, while a moderate code lengthallows to keep the latency low. The interleaver of the LDPCmatrix that we consider is inspired to the DVB-S2 standardone. A novel approach for avoiding short cycles is analyzed. Amodified BP decoding algorithm is applied in order to deal withlonger cycles. Simulations and results for the AWGN channel arepresented, both for BPSK signalling and for coded modulationbased on the partitionℤ2/4ℤ2.